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<meta name="description" content="A diagram showing nodes connected by different kinds of links with concentric circular backgrounds.  Clicking on a node opens a window to a Wikipedia page."/> 
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<title>Euler Diagram</title>
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          <h1 class="mb-0 p-1 ">GoJS</h1>
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    <!-- Start of GoJS sample code -->
    
    <script src="../release/go.js"></script>
    <div class="p-4 w-full">
  <script src="../extensions/HyperlinkText.js"></script>
    <script id="code">
    function init() {
      var $ = go.GraphObject.make;

      myDiagram =
        $(go.Diagram, "myDiagramDiv",
          { isReadOnly: true, allowSelect: false, contentAlignment: go.Spot.Center });

      myDiagram.nodeTemplate =
        $(go.Node, "Auto",
          { locationSpot: go.Spot.Center },
          new go.Binding("location", "loc", go.Point.parse),
          $(go.Shape, "Ellipse",
            { fill: "transparent" },
            new go.Binding("stroke", "color"),
            new go.Binding("strokeWidth", "width"),
            new go.Binding("strokeDashArray", "dash")),
          $("HyperlinkText",
            function(node) { return "https://en.wikipedia.org/w/index.php?search=" + encodeURIComponent(node.data.text); },
            function(node) { return node.data.text; },
            { margin: 1, maxSize: new go.Size(80, 80), textAlign: "center" })
        );

      myDiagram.nodeTemplateMap.add("center",
        $(go.Node, "Spot",
          { locationSpot: go.Spot.Center },
          new go.Binding("location", "loc", go.Point.parse),
          $(go.Shape, "Circle",
            {
              fill: "rgba(128,128,128,0.1)", stroke: null,
              width: 550, height: 550
            }),
          $(go.Shape, "Circle",
            {
              fill: "rgba(128,128,128,0.05)", stroke: null,
              width: 400, height: 400
            }),
          $(go.Shape, "Circle",
            {
              fill: "rgba(128,128,128,0.033)", stroke: null,
              width: 250, height: 250
            }),
          $(go.Panel, "Spot",
            $(go.Shape, "Circle",
              { isPanelMain: true, fill: "transparent", portId: "" },
              new go.Binding("stroke", "hicolor"),
              new go.Binding("strokeWidth", "hiwidth")),
            $(go.Shape, "Circle",
              { isPanelMain: true, fill: "transparent" },
              new go.Binding("stroke", "color"),
              new go.Binding("strokeWidth", "width"),
              new go.Binding("strokeDashArray", "dash")),
            $("HyperlinkText",
              function(node) { return "https://en.wikipedia.org/w/index.php?search=" + encodeURIComponent(node.data.text); },
              function(node) { return node.data.text; },
              { margin: 1, maxSize: new go.Size(80, 80), textAlign: "center" })
          )
        ));

      myDiagram.linkTemplate =
        $(go.Link,
          $(go.Shape,
            new go.Binding("stroke", "color"),
            new go.Binding("strokeWidth", "width"),
            new go.Binding("strokeDashArray", "dash"))
        );

      var nodeDataArray = [
        { key: 1, text: "Cognitive Procedural", loc: "300 300", category: "center" },
        { key: 2, text: "Cognitive Problem Solving", loc: "600 300", category: "center", hicolor: "lightblue", hiwidth: 7 },
        { key: 11, text: "Logical Reasoning", loc: "450 275" },
        { key: 12, text: "Scaffolding", loc: "450 325" },
        { key: 13, text: "Part Task Training", loc: "425 400" },
        { key: 21, text: "Training Wheels", loc: "325 125" },
        { key: 22, text: "Exploratory Learning", loc: "250 150" },
        { key: 23, text: "Learner Control", loc: "650 150" },
        { key: 31, text: "Overlearning", loc: "450 475" }
      ];
      var linkDataArray = [
        { from: 1, to: 11, color: "gray" },
        { from: 1, to: 12, color: "gray", dash: [3, 2] },
        { from: 1, to: 13, color: "olive", width: 2 },
        { from: 1, to: 21, color: "olive", width: 3 },
        { from: 1, to: 22, color: "olive", width: 2 },
        { from: 1, to: 23, color: "crimson", width: 2 },
        { from: 1, to: 31 },
        { from: 2, to: 11, color: "gray" },
        { from: 2, to: 12, color: "olive", width: 2 },
        { from: 2, to: 13, color: "gray", dash: [3, 2] },
        { from: 2, to: 21, color: "crimson", width: 2 },
        { from: 2, to: 22, color: "crimson", width: 2 },
        { from: 2, to: 23, color: "black", width: 3 },
        { from: 2, to: 31, color: "black", dash: [3, 2] }
      ];
      myDiagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
    }
    window.addEventListener('DOMContentLoaded', init);
  </script>

<div id="sample">
  <div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:600px"></div>
  <p> A sample of a Euler diagram: that is, a means of representing various sets and their relationships with one another. Euler diagrams have much in common with Venn diagrams.
    This diagram is read-only, but clicking on a node will search Wikipedia
    with a query string generated from the "text" property of the node data.
  </p>
</div>
    </div>
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